Hi, I don't know much about networking or IP addresses but I have the following setup:

1. Two home PC's (Windows XP) connected to a switch and sharing a broadband internet modem.

2. A laptop computer (Windows XP) connected to the internet via dial up connection.

One of the home PC's has an application running on it that can be viewed remotely over the internet. I have installed the 'remote viewer' part of the application on the laptop but when I dial up to the internet and insert the IP address of the home PC in the remote viewer application it fails and can't connect. When I try pinging the home PC from the laptop it also fails.

I'm not 100% sure I am using the correct IP address because on the home PC itself it shows one IP address under the Control Panel and a different IP address when I go to www.whatismyip.com (or similar websites). Is one of these the IP address of the ISP?

What do I need to do to configure this correctly so I can view the application on the home PC from a different location using the laptop?

Any help much appreciated.

The IP address shown at www.whatismyip.com is the one, given to you by your ISP.
All computers inside your network will use this IP address to browse the internet.

There are also private IP addresses, that are never shown through the internet.
E.g. 192.168.0.x

So you have to use the public IP address, to access the that application from the internet.
If there is a router infront of all your home PCs, with a firewall enabled, you must forward the port, used by your applicatio.

Paul

If you have the router that connects to Internet, then enable port forwarding on router will solve your problem..

Thanks for your help Paul and Picohat.

I've been away all week but tomorrow I will try and enable the port forwarding on my router and see how that goes.

Cheers, O-D.

I clicked on picohat's 'port forwarding' link and it says "When you do this configuration on router, you need to know the ports that used by the software/server that you plan to have port forwarding, and then configure the port information and also the computer IP that will run that application/server."

How do I find out the port number for the computer running the application I want to access?

I followed the steps to configure my modem here: http://portforward.com/english/rout... but I'm not sure what ports to put in for the 'NAT Rule'.

To figure out the port used by the application, simply open a command prompt and type in:

netstat -anb | more

You'll get a list of all ports thar computer listens on and the appropriated application.

Great, thanks for that paulsep. It looks like the application is using port 1740.

Here's what I've done so far:

1. Set up static IP addresses.

2. Set up port forwarding on my Dynalink RTA100+ router as follows:

Rule ID - 2
Rule Flavor - RDR
IF name - ALL
Protocol - ANY
Local address from - 192.16x.x.xxx (static IP).
Local address to - 192.16x.x.xxx (same static IP).
Global address from - 0.0.0.0
Global address to - 0.0.0.0
Destination port from - 1740
Destination port to - 1740

Does this look right?

So if this is correct, all I have to do now is run the 'remote viewer' application on the laptop using the public (ISP) IP address 203.xxx.x.xxx of my home PC?

Yepp, I would say this should work.

When you're trying to connect to the application on that server, maybe you have to give the remote viewer the public ip of your server and the port used at the server side, in this case 1740.

Unfortunately the message I get on the remote viewer is "Connecting to 203.xxx.xx.xx........failed".

It doesn't ask me for a port, just a single pop up window prompting me to 'Input Server Name or IP Address'.

I tried pinging my ISP IP address from the laptop and it says Request timed out.

Any other suggestions?

Regards, Olidogg.

If you're asked for the ip address, type in the ip address, a colon and the port and try again.

E.g.: 203.123.234.111:1740

This should work for you.

Paul

No luck with that Paul, it says "Error: 0".

hi there OLIDOGG, and all readers/helpers.

I'm about to set up my computer to run a intranet and ineternet ADSL conncetion though a hub so I will also be following your progress as I develop my system here.
I'm also attempting to run my homepage with my own "DomainName" and figuring out how to point that to my IP address, but thats another thing al together ...
I use a router to connectt my interanet where (if I've figured it right) your running a ADSL ISP and a modem ISP (p.s. watch out for the modeming costs/charges toO, they might be high for example $2.50 per hour is Telecom Xtra's charger even when they call it a complimentary service to their ADSL costomers just ring your ISP and ask.)
Presently I'm just getting used to these message board configurations here and will return asap. when I see that I can help.

In the mean time try checking the names of the computers your trying to connect.
I've found from a past setup that there are two or three setting each way from one computer to the other - both output/input IP numbers twice and host/client names on each, opps that seems to be actually four.

although I may be running on a different tangent because I used a hub not a router.
(or are they the same thing ..LOL)
till next place
mdbobbo

designer of AngStromega a solar powered semi submersable all terrain vehicle for the change over from Fossel fuel to Solar only powered transportation, electrification and Communication. Researched an

OLIDOGG, have you checked whether the port 1740 is open.

For a port scan from the internet to your server, use this link.
http://www.auditmypc.com

mdbobbo
start your own thread. in this forum its rude to tag onto someone elses. fyi

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